Error  cannot access archive files

The archive files could not be accessed, probably because they are being updated.
Please try again in about 30 seconds, and report the problem if it persists
for more than a few minutes. The file that could not be opened is '/var/www/www.listas.usc.es/listas/alumnos-veterinaria/alumnos-veterinaria.ind1611' and
the error code was 2.